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|
-- cabal-helper: Simple interface to Cabal's configuration state
-- Copyright (C) 2018 Daniel Gröber <cabal-helper@dxld.at>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
{-|
Module : CabalHelper.Compiletime.Log
Description : Logging utilities
License : GPL-3
-}
module CabalHelper.Compiletime.Log where
import Control.Monad.IO.Class
import System.IO
import System.IO.Error
import CabalHelper.Compiletime.Types
logIOError :: Verbose => String -> IO (Maybe a) -> IO (Maybe a)
logIOError label a = do
a `catchIOError` \ex -> do
vLog $ label ++ ": " ++ show ex
return Nothing
vLog :: (MonadIO m, Verbose) => String -> m ()
vLog msg
| ?verbose 0 = liftIO $ hPutStrLn stderr msg
| otherwise = return ()
|
